HF GWR radar receiver

HF wideband digital reconnoitering receiver

(HF-DF) Chemical (HF-DF) Lasers

HF ground wave radar (HF-GWR)

HF-SWR(HF-Surface Wave Radar)

enhanced group calling receiver {= EGC receiver}

(Hf) hafnium

4-89HF

Ab initio HF method

adaptive HF station

adjustable dipole HF antenna

airdrive HF hot-unionizer

air-ground HF communication

alternating HCl HF acid

Anti-HF treatment

atmospheric HF analyzer

automated HF radio networks

buffer regulated HF acid

cathode-ray HF direction finder